You miss the forest for the trees — fedora also has a version with immutable roots, it is a feature, and is absolutely not meant as anti-privacy, it is there for proper rollbacks and imo it is absolutely superior (with NixOS’s model).
For what it’s worth, Plasma’s file indexer is much more invasive in terms of running at the wrong times in my experience, so depending on what one mean, Linux also have similar services.
If it were privacy-first and read only, that would be another thing entirely. Defaults matter.